I am able to connect my postfix server with TLS. All things are set up. But when i send a message with this secure connection, target server (for example gmail) receive my message without TLS/SSL secure connection.

If i use another server which has a cpanel, Gmail receive that message by ESMTP S. But when i sent a message to gmail account, it received by ESMTP (not with TLS connection.)

Sincerely, I discovered that my postfix server does not negotiate with target via SSL/TLS encrypted connection.